Tape Drives Offline!
I have an attached tape library which has been working well for a few months since we installed it.
It has 4 tape drives inside.
Today 1 drive went offline. Then another. And this afternoon a 3rd one went offline.
When I bring a drive online via the All Storage GUI, it falls back offline in a few minutes.
If I run a cleaning job to clean the tape (just in case that was the issue) it goes offline while trying to clean.
Check in Windows Device Manaer if you are able to 4 Tape drives or if the 5th is visible here. If the 5th is visible, then you would have to uninstall the drivers, remove all the drives and the reboot the server to add them back. Make sure that all the Tape drives visible there are using Symantec Tape Drivers.You would also have to remove the RL from BE and restart the services to allow autodetect.
If the device manager is showing only 4 drives, then confirm that all the drives are using Symantec Drivers. You could use the Tapeinst.exe from Backup Exec program folder to update the drivers on all the drives. After this, Disable and remove all the Tape Drives from BE devices tab and restart the services. They should now be auto detected back again.